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Likely candidates are a vacuum leak, a faulty Throttle Position Sensor (TPS) or another sensor. OBDII readers which display fault codes are very reasonably priced these days and would in most cases tell you right away what the problem is.
You will probably need tor replace the throttle position sensor....TPS... You can check and make sure the wiring is connected...Easy to find it is located on the side of your throttle body...usually on the right hand side, or toward the front of the car on your engine....
A strong possibility of a defective Throttle Positioning Sensor (TPS)...It can be tested with a volt meter...TPS is located on the throttle body (see diagram below) & has a three pin connector with following wire colors; Brown (ground)...Yellow (+5 volts)...And White (TPS output)...Set meter to 5 volt dc...Push point,of safety pins into the Yellow and Brown wire at rear of connector...Do not disconnect connector...connect + lead to Yellow pin and - lead to Brown pin...Turn key on...Meter must read at least .08 volts...Open throttle full...Meter must read at least 4 volts...If not TPS is defective...Send results...NOTE>>>Diagram is based on a 2.0L Single Overhead Cam Engine, if your vehicle is different let me know...saailer
TPS = Throttle Position Sensor. It attaches to side of throttlebody and moves via your throttle shaft, sending information back to computer for proper fuel delivery. If you look on opposite side of throttle body where your throttle cable/linkages are attached, you will find the TPS. Usually held on by 2 screws, and there will be an electrical connector attached.
your TPS is the fault. The TPS(throttle position sensor) is located on the throttle body and is responsible for your idle speed. when this is faulty the engine speed sensor tells the ecm that the engines is losing rpm and then the ecm tells the fuel pressure regulater to give more fuel so this loads the throttle body up and you basically are flooding the throttle body and that's when ypou get a bog down. change the tps and this will solve it...please rate the solution..........thanks
I don't know how many miles you have or the condition of the car, but it sounds like it might just be your TPS (throttle position sensor) might be bad as well as the throttle could be sticking open and just need to be cleaned. Find where the throttle cable goes to the intake and just take some spray injector cleaner or something of that nature to clean the throttle plate. Start with the latter first.